package com.baomidou.kisso.common.bcprov.asn1;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import com.baomidou.kisso.common.bcprov.util.Arrays;
import com.baomidou.kisso.common.bcprov.util.encoders.Hex;

public abstract class ASN1OctetString extends ASN1Primitive implements ASN1OctetStringParser {

	byte[] string;


	/**
	 * return an Octet String from a tagged object.
	 *
	 * @param obj the tagged object holding the object we want.
	 * @param explicit true if the object is meant to be explicitly
	 *              tagged false otherwise.
	 * @exception IllegalArgumentException if the tagged object cannot
	 *              be converted.
	 */
	public static ASN1OctetString getInstance( ASN1TaggedObject obj, boolean explicit ) {
		ASN1Primitive o = obj.getObject();

		if ( explicit || o instanceof ASN1OctetString ) {
			return getInstance(o);
		} else {
			return BEROctetString.fromSequence(ASN1Sequence.getInstance(o));
		}
	}


	/**
	 * return an Octet String from the given object.
	 *
	 * @param obj the object we want converted.
	 * @exception IllegalArgumentException if the object cannot be converted.
	 */
	public static ASN1OctetString getInstance( Object obj ) {
		if ( obj == null || obj instanceof ASN1OctetString ) {
			return (ASN1OctetString) obj;
		} else if ( obj instanceof byte[] ) {
			try {
				return ASN1OctetString.getInstance(ASN1Primitive.fromByteArray((byte[]) obj));
			} catch ( IOException e ) {
				throw new IllegalArgumentException("failed to construct OCTET STRING from byte[]: " + e.getMessage());
			}
		} else if ( obj instanceof ASN1Encodable ) {
			ASN1Primitive primitive = ((ASN1Encodable) obj).toASN1Primitive();

			if ( primitive instanceof ASN1OctetString ) {
				return (ASN1OctetString) primitive;
			}
		}

		throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
	}


	/**
	 * @param string the octets making up the octet string.
	 */
	public ASN1OctetString( byte[] string ) {
		if ( string == null ) {
			throw new NullPointerException("string cannot be null");
		}
		this.string = string;
	}


	public InputStream getOctetStream() {
		return new ByteArrayInputStream(string);
	}


	public ASN1OctetStringParser parser() {
		return this;
	}


	public byte[] getOctets() {
		return string;
	}


	public int hashCode() {
		return Arrays.hashCode(this.getOctets());
	}


	boolean asn1Equals( ASN1Primitive o ) {
		if ( !(o instanceof ASN1OctetString) ) {
			return false;
		}

		ASN1OctetString other = (ASN1OctetString) o;

		return Arrays.areEqual(string, other.string);
	}


	public ASN1Primitive getLoadedObject() {
		return this.toASN1Primitive();
	}


	ASN1Primitive toDERObject() {
		return new DEROctetString(string);
	}


	ASN1Primitive toDLObject() {
		return new DEROctetString(string);
	}


	abstract void encode( ASN1OutputStream out ) throws IOException;


	public String toString() {
		return "#" + new String(Hex.encode(string));
	}
}
